Problems with AMD64 and 8 GB RAM?

John Baldwin jhb at
Wed Mar 30 20:01:12 PST 2005

On Mar 30, 2005, at 8:54 PM, Greg 'groggy' Lehey wrote:
>>  lapic0: LINT1 trigger: edge
>>  lapic0: LINT1 polarity: high
>>  lapic1: Routing NMI -> LINT1
>>  lapic1: LINT1 trigger: edge
>>  lapic1: LINT1 polarity: high
>> -ioapic0 <Version 0.3> irqs 0-23 on motherboard
>> +ioapic0 <Version 0.0> irqs 0-23 on motherboard
>>  cpu0 BSP:
>>       ID: 0x00000000   VER: 0x00040010 LDR: 0x01000000 DFR: 0x0fffffff
>>    lint0: 0x00010700 lint1: 0x00000400 TPR: 0x00000000 SVR: 0x000001ff

This shows that in the - case the APIC is broken somehow (0.0 isn't a 
valid I/O APIC version).  It would seem that the system has mapped RAM 
over top of the I/O APIC perhaps?  It would be interesting to see the 
contents of your MADT to see if it's trying to use a 64-bit PA for your 
APIC.  The local APIC portion seems ok though.


John Baldwin <jhb at>  <><
"Power Users Use the Power to Serve"  =

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